diff --git a/nixos/flakes/cloudflare-ddns.nix b/nixos/flakes/cloudflare-ddns.nix
index 3e3a7d0..5048226 100644
--- a/nixos/flakes/cloudflare-ddns.nix
+++ b/nixos/flakes/cloudflare-ddns.nix
@@ -1,9 +1,7 @@
 { config, pkgs, ... }:
 
 let
-  script = pkgs.substituteAll {
-    src = ../../scripts/cloudflare-ddns.sh;
-
+  script = pkgs.replaceVars ../../scripts/cloudflare-ddns.sh {
     bash = pkgs.bash;
     curl = pkgs.curl;
     jq = pkgs.jq;